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(ITS#7664) LMDB: Opening a non existing environment with MDB_RDONLY leaves a stale lock file

Full_Name: Salvador Ortiz
Version: 24
OS: Linux
Submission from: (NULL) (

Trying to open a non existent environment using MDB_RDONLY, fails with ENOENT as
expected, but the lock file is created and is preserved, an issue of pollution

The problem lies in the unconditional use of O_CREATE in mdb_env_setup_locks.
I'm not sure what is the best solution.